把7：13的前项加上14，要使比值不变，后项应加上______．

Should teenagers help their parents do chores? Is it important for us to learn how to do chores?

I have a classmate called Li Ting. She is the only child in her family. Her parents love her so much that they don’t let her do any chores. On weekdays she gets up, has meals, goes to school, has lessons, she only plays with her friends. So she doesn’t know how to do chores. One day, her father was badly ill and was in hospital. Her mother had to take care of her father in the hospital and couldn’t cook meals for her for a week. Li Ting didn’t know how to cook meals. She had a lot of trouble cooking meals and often felt hungry. She only had instant noodles(方便面)for her meals.

From the story, we know it’s very important for us to learn to do chores.

小题1:How many children are there in Li Ting’s family?

A．Two.

B．Three.

C．One.

D．Four.小题2:The writer thinks it is________ for teenagers to learn to do chores.

A．wrong

B．important

C．interesting

D．boring小题3: Li Ting doesn’t__________.

A．do chores on weekends

B．go to school on weekdays

C．do her homework on weekdays

D．have meals on weekends小题4: Why did Li Ting only have instant noodles for her meals when her parents weren’t at home?

Her parents didn’t give her enough money.

B. She couldn’t cook meals.

C. She liked eating instant noodles very much.

D. She didn’t enjoy doing any chores.

小题5:Which of the following is NOT true?

A．Li Ting’s grandmother looked after her when her father was in hospital.

B．Li Ting couldn’t do any chores.

C．Li Ting’s parents love her very much.

D．Li Ting was often hungry when her father was in hospital.

在结构化开发中，数据流图是（）阶段产生的成果。

A．总体设计

B．程序编码

C．详细设计

D．需求分析

肺炎球菌肺炎在炎症消散后（）

A.肺部遗留纤维化

B.肺泡功能受损

C.肺组织完全恢复正常

D.胸膜粘连、增厚

E.以上都不是

华县地震

在利用已进行模型校正地区的传播模型参数进行预规划仿真或者链路预算时，如何选择合适的传播模型需要注意以下条件（）

A.地形需要尽量吻合，可以通过数字地图或简单的环境勘测获得

B.地物密度需要相似，可以通过简单的环境勘测获得

C.地物高度差异不明显，可以通过数字地图或简单的环境勘测获得

D.天线高度和周围平均建筑物高度之间的相对关系，影响不明显，可以忽略